Freezing weather may make it hard to believe, but many Chicago-area gardeners — and their plants — are now living in a slightly warmer world, according to a new version of the USDA’s plant hardiness ...
The U.S. Department of Agriculture unveiled its long-awaited update of its 1990 U.S. Plant Hardiness Zone Map Thursday at the National Arboretum in Washington. The map, which was revised to reflect ...